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|
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This file implements an ast.Importer for gc generated object files.
// TODO(gri) Eventually move this into a separate package outside types.
package types
import (
"errors"
"fmt"
"go/ast"
"go/token"
"io"
"math/big"
"os"
"path/filepath"
"runtime"
"strconv"
"text/scanner"
)
const trace = false // set to true for debugging
var (
pkgRoot = filepath.Join(runtime.GOROOT(), "pkg", runtime.GOOS+"_"+runtime.GOARCH)
pkgExts = [...]string{".a", ".5", ".6", ".8"}
)
// findPkg returns the filename and package id for an import path.
// If no file was found, an empty filename is returned.
func findPkg(path string) (filename, id string) {
if len(path) == 0 {
return
}
id = path
var noext string
switch path[0] {
default:
// "x" -> "$GOROOT/pkg/$GOOS_$GOARCH/x.ext", "x"
noext = filepath.Join(pkgRoot, path)
case '.':
// "./x" -> "/this/directory/x.ext", "/this/directory/x"
cwd, err := os.Getwd()
if err != nil {
return
}
noext = filepath.Join(cwd, path)
id = noext
case '/':
// "/x" -> "/x.ext", "/x"
noext = path
}
// try extensions
for _, ext := range pkgExts {
filename = noext + ext
if f, err := os.Stat(filename); err == nil && !f.IsDir() {
return
}
}
filename = "" // not found
return
}
// gcParser parses the exports inside a gc compiler-produced
// object/archive file and populates its scope with the results.
type gcParser struct {
scanner scanner.Scanner
tok rune // current token
lit string // literal string; only valid for Ident, Int, String tokens
id string // package id of imported package
imports map[string]*ast.Object // package id -> package object
}
func (p *gcParser) init(filename, id string, src io.Reader, imports map[string]*ast.Object) {
p.scanner.Init(src)
p.scanner.Error = func(_ *scanner.Scanner, msg string) { p.error(msg) }
p.scanner.Mode = scanner.ScanIdents | scanner.ScanInts | scanner.ScanChars | scanner.ScanStrings | scanner.ScanComments | scanner.SkipComments
p.scanner.Whitespace = 1<<'\t' | 1<<' '
p.scanner.Filename = filename // for good error messages
p.next()
p.id = id
p.imports = imports
}
func (p *gcParser) next() {
p.tok = p.scanner.Scan()
switch p.tok {
case scanner.Ident, scanner.Int, scanner.String:
p.lit = p.scanner.TokenText()
default:
p.lit = ""
}
if trace {
fmt.Printf("%s: %q -> %q\n", scanner.TokenString(p.tok), p.scanner.TokenText(), p.lit)
}
}
// GcImporter implements the ast.Importer signature.
func GcImporter(imports map[string]*ast.Object, path string) (pkg *ast.Object, err error) {
if path == "unsafe" {
return Unsafe, nil
}
defer func() {
if r := recover(); r != nil {
err = r.(importError) // will re-panic if r is not an importError
if trace {
panic(err) // force a stack trace
}
}
}()
filename, id := findPkg(path)
if filename == "" {
err = errors.New("can't find import: " + id)
return
}
if pkg = imports[id]; pkg != nil {
return // package was imported before
}
buf, err := ExportData(filename)
if err != nil {
return
}
defer buf.Close()
if trace {
fmt.Printf("importing %s (%s)\n", id, filename)
}
var p gcParser
p.init(filename, id, buf, imports)
pkg = p.parseExport()
return
}
// Declare inserts a named object of the given kind in scope.
func (p *gcParser) declare(scope *ast.Scope, kind ast.ObjKind, name string) *ast.Object {
// the object may have been imported before - if it exists
// already in the respective package scope, return that object
if obj := scope.Lookup(name); obj != nil {
assert(obj.Kind == kind)
return obj
}
// otherwise create a new object and insert it into the package scope
obj := ast.NewObj(kind, name)
if scope.Insert(obj) != nil {
p.errorf("already declared: %v %s", kind, obj.Name)
}
// a new type object is a named type and may be referred
// to before the underlying type is known - set it up
if kind == ast.Typ {
obj.Type = &Name{Obj: obj}
}
return obj
}
// ----------------------------------------------------------------------------
// Error handling
// Internal errors are boxed as importErrors.
type importError struct {
pos scanner.Position
err error
}
func (e importError) Error() string {
return fmt.Sprintf("import error %s (byte offset = %d): %s", e.pos, e.pos.Offset, e.err)
}
func (p *gcParser) error(err interface{}) {
if s, ok := err.(string); ok {
err = errors.New(s)
}
// panic with a runtime.Error if err is not an error
panic(importError{p.scanner.Pos(), err.(error)})
}
func (p *gcParser) errorf(format string, args ...interface{}) {
p.error(fmt.Sprintf(format, args...))
}
func (p *gcParser) expect(tok rune) string {
lit := p.lit
if p.tok != tok {
panic(1)
p.errorf("expected %s, got %s (%s)", scanner.TokenString(tok), scanner.TokenString(p.tok), lit)
}
p.next()
return lit
}
func (p *gcParser) expectSpecial(tok string) {
sep := 'x' // not white space
i := 0
for i < len(tok) && p.tok == rune(tok[i]) && sep > ' ' {
sep = p.scanner.Peek() // if sep <= ' ', there is white space before the next token
p.next()
i++
}
if i < len(tok) {
p.errorf("expected %q, got %q", tok, tok[0:i])
}
}
func (p *gcParser) expectKeyword(keyword string) {
lit := p.expect(scanner.Ident)
if lit != keyword {
p.errorf("expected keyword %s, got %q", keyword, lit)
}
}
// ----------------------------------------------------------------------------
// Import declarations
// ImportPath = string_lit .
//
func (p *gcParser) parsePkgId() *ast.Object {
id, err := strconv.Unquote(p.expect(scanner.String))
if err != nil {
p.error(err)
}
switch id {
case "":
// id == "" stands for the imported package id
// (only known at time of package installation)
id = p.id
case "unsafe":
// package unsafe is not in the imports map - handle explicitly
return Unsafe
}
pkg := p.imports[id]
if pkg == nil {
scope = ast.NewScope(nil)
pkg = ast.NewObj(ast.Pkg, "")
pkg.Data = scope
p.imports[id] = pkg
}
return pkg
}
// dotIdentifier = ( ident | '·' ) { ident | int | '·' } .
func (p *gcParser) parseDotIdent() string {
ident := ""
if p.tok != scanner.Int {
sep := 'x' // not white space
for (p.tok == scanner.Ident || p.tok == scanner.Int || p.tok == '·') && sep > ' ' {
ident += p.lit
sep = p.scanner.Peek() // if sep <= ' ', there is white space before the next token
p.next()
}
}
if ident == "" {
p.expect(scanner.Ident) // use expect() for error handling
}
return ident
}
// ExportedName = "@" ImportPath "." dotIdentifier .
//
func (p *gcParser) parseExportedName() (*ast.Object, string) {
p.expect('@')
pkg := p.parsePkgId()
p.expect('.')
name := p.parseDotIdent()
return pkg, name
}
// ----------------------------------------------------------------------------
// Types
// BasicType = identifier .
//
func (p *gcParser) parseBasicType() Type {
id := p.expect(scanner.Ident)
obj := Universe.Lookup(id)
if obj == nil || obj.Kind != ast.Typ {
p.errorf("not a basic type: %s", id)
}
return obj.Type.(Type)
}
// ArrayType = "[" int_lit "]" Type .
//
func (p *gcParser) parseArrayType() Type {
// "[" already consumed and lookahead known not to be "]"
lit := p.expect(scanner.Int)
p.expect(']')
elt := p.parseType()
n, err := strconv.ParseUint(lit, 10, 64)
if err != nil {
p.error(err)
}
return &Array{Len: n, Elt: elt}
}
// MapType = "map" "[" Type "]" Type .
//
func (p *gcParser) parseMapType() Type {
p.expectKeyword("map")
p.expect('[')
key := p.parseType()
p.expect(']')
elt := p.parseType()
return &Map{Key: key, Elt: elt}
}
// Name = identifier | "?" | ExportedName .
//
func (p *gcParser) parseName() (name string) {
switch p.tok {
case scanner.Ident:
name = p.lit
p.next()
case '?':
// anonymous
p.next()
case '@':
// exported name prefixed with package path
_, name = p.parseExportedName()
default:
p.error("name expected")
}
return
}
// Field = Name Type [ string_lit ] .
//
func (p *gcParser) parseField() (fld *ast.Object, tag string) {
name := p.parseName()
ftyp := p.parseType()
if name == "" {
// anonymous field - ftyp must be T or *T and T must be a type name
if _, ok := Deref(ftyp).(*Name); !ok {
p.errorf("anonymous field expected")
}
}
if p.tok == scanner.String {
tag = p.expect(scanner.String)
}
fld = ast.NewObj(ast.Var, name)
fld.Type = ftyp
return
}
// StructType = "struct" "{" [ FieldList ] "}" .
// FieldList = Field { ";" Field } .
//
func (p *gcParser) parseStructType() Type {
var fields []*ast.Object
var tags []string
parseField := func() {
fld, tag := p.parseField()
fields = append(fields, fld)
tags = append(tags, tag)
}
p.expectKeyword("struct")
p.expect('{')
if p.tok != '}' {
parseField()
for p.tok == ';' {
p.next()
parseField()
}
}
p.expect('}')
return &Struct{Fields: fields, Tags: tags}
}
// Parameter = ( identifier | "?" ) [ "..." ] Type [ string_lit ] .
//
func (p *gcParser) parseParameter() (par *ast.Object, isVariadic bool) {
name := p.parseName()
if name == "" {
name = "_" // cannot access unnamed identifiers
}
if p.tok == '.' {
p.expectSpecial("...")
isVariadic = true
}
ptyp := p.parseType()
// ignore argument tag
if p.tok == scanner.String {
p.expect(scanner.String)
}
par = ast.NewObj(ast.Var, name)
par.Type = ptyp
return
}
// Parameters = "(" [ ParameterList ] ")" .
// ParameterList = { Parameter "," } Parameter .
//
func (p *gcParser) parseParameters() (list []*ast.Object, isVariadic bool) {
parseParameter := func() {
par, variadic := p.parseParameter()
list = append(list, par)
if variadic {
if isVariadic {
p.error("... not on final argument")
}
isVariadic = true
}
}
p.expect('(')
if p.tok != ')' {
parseParameter()
for p.tok == ',' {
p.next()
parseParameter()
}
}
p.expect(')')
return
}
// Signature = Parameters [ Result ] .
// Result = Type | Parameters .
//
func (p *gcParser) parseSignature() *Func {
params, isVariadic := p.parseParameters()
// optional result type
var results []*ast.Object
switch p.tok {
case scanner.Ident, '[', '*', '<', '@':
// single, unnamed result
result := ast.NewObj(ast.Var, "_")
result.Type = p.parseType()
results = []*ast.Object{result}
case '(':
// named or multiple result(s)
var variadic bool
results, variadic = p.parseParameters()
if variadic {
p.error("... not permitted on result type")
}
}
return &Func{Params: params, Results: results, IsVariadic: isVariadic}
}
// MethodSpec = ( identifier | ExportedName ) Signature .
//
func (p *gcParser) parseMethodSpec() *ast.Object {
if p.tok == scanner.Ident {
p.expect(scanner.Ident)
} else {
p.parseExportedName()
}
p.parseSignature()
// TODO(gri) compute method object
return ast.NewObj(ast.Fun, "_")
}
// InterfaceType = "interface" "{" [ MethodList ] "}" .
// MethodList = MethodSpec { ";" MethodSpec } .
//
func (p *gcParser) parseInterfaceType() Type {
var methods ObjList
parseMethod := func() {
meth := p.parseMethodSpec()
methods = append(methods, meth)
}
p.expectKeyword("interface")
p.expect('{')
if p.tok != '}' {
parseMethod()
for p.tok == ';' {
p.next()
parseMethod()
}
}
p.expect('}')
methods.Sort()
return &Interface{Methods: methods}
}
// ChanType = ( "chan" [ "<-" ] | "<-" "chan" ) Type .
//
func (p *gcParser) parseChanType() Type {
dir := ast.SEND | ast.RECV
if p.tok == scanner.Ident {
p.expectKeyword("chan")
if p.tok == '<' {
p.expectSpecial("<-")
dir = ast.SEND
}
} else {
p.expectSpecial("<-")
p.expectKeyword("chan")
dir = ast.RECV
}
elt := p.parseType()
return &Chan{Dir: dir, Elt: elt}
}
// Type =
// BasicType | TypeName | ArrayType | SliceType | StructType |
// PointerType | FuncType | InterfaceType | MapType | ChanType |
// "(" Type ")" .
// BasicType = ident .
// TypeName = ExportedName .
// SliceType = "[" "]" Type .
// PointerType = "*" Type .
// FuncType = "func" Signature .
//
func (p *gcParser) parseType() Type {
switch p.tok {
case scanner.Ident:
switch p.lit {
default:
return p.parseBasicType()
case "struct":
return p.parseStructType()
case "func":
// FuncType
p.next()
return p.parseSignature()
case "interface":
return p.parseInterfaceType()
case "map":
return p.parseMapType()
case "chan":
return p.parseChanType()
}
case '@':
// TypeName
pkg, name := p.parseExportedName()
return p.declare(pkg.Data.(*ast.Scope), ast.Typ, name).Type.(Type)
case '[':
p.next() // look ahead
if p.tok == ']' {
// SliceType
p.next()
return &Slice{Elt: p.parseType()}
}
return p.parseArrayType()
case '*':
// PointerType
p.next()
return &Pointer{Base: p.parseType()}
case '<':
return p.parseChanType()
case '(':
// "(" Type ")"
p.next()
typ := p.parseType()
p.expect(')')
return typ
}
p.errorf("expected type, got %s (%q)", scanner.TokenString(p.tok), p.lit)
return nil
}
// ----------------------------------------------------------------------------
// Declarations
// ImportDecl = "import" identifier string_lit .
//
func (p *gcParser) parseImportDecl() {
p.expectKeyword("import")
// The identifier has no semantic meaning in the import data.
// It exists so that error messages can print the real package
// name: binary.ByteOrder instead of "encoding/binary".ByteOrder.
name := p.expect(scanner.Ident)
pkg := p.parsePkgId()
assert(pkg.Name == "" || pkg.Name == name)
pkg.Name = name
}
// int_lit = [ "+" | "-" ] { "0" ... "9" } .
//
func (p *gcParser) parseInt() (sign, val string) {
switch p.tok {
case '-':
p.next()
sign = "-"
case '+':
p.next()
}
val = p.expect(scanner.Int)
return
}
// number = int_lit [ "p" int_lit ] .
//
func (p *gcParser) parseNumber() Const {
// mantissa
sign, val := p.parseInt()
mant, ok := new(big.Int).SetString(sign+val, 10)
assert(ok)
if p.lit == "p" {
// exponent (base 2)
p.next()
sign, val = p.parseInt()
exp64, err := strconv.ParseUint(val, 10, 0)
if err != nil {
p.error(err)
}
exp := uint(exp64)
if sign == "-" {
denom := big.NewInt(1)
denom.Lsh(denom, exp)
return Const{new(big.Rat).SetFrac(mant, denom)}
}
if exp > 0 {
mant.Lsh(mant, exp)
}
return Const{new(big.Rat).SetInt(mant)}
}
return Const{mant}
}
// ConstDecl = "const" ExportedName [ Type ] "=" Literal .
// Literal = bool_lit | int_lit | float_lit | complex_lit | string_lit .
// bool_lit = "true" | "false" .
// complex_lit = "(" float_lit "+" float_lit ")" .
// rune_lit = "(" int_lit "+" int_lit ")" .
// string_lit = `"` { unicode_char } `"` .
//
func (p *gcParser) parseConstDecl() {
p.expectKeyword("const")
pkg, name := p.parseExportedName()
obj := p.declare(pkg.Data.(*ast.Scope), ast.Con, name)
var x Const
var typ Type
if p.tok != '=' {
obj.Type = p.parseType()
}
p.expect('=')
switch p.tok {
case scanner.Ident:
// bool_lit
if p.lit != "true" && p.lit != "false" {
p.error("expected true or false")
}
x = Const{p.lit == "true"}
typ = Bool.Underlying
p.next()
case '-', scanner.Int:
// int_lit
x = p.parseNumber()
typ = Int.Underlying
if _, ok := x.val.(*big.Rat); ok {
typ = Float64.Underlying
}
case '(':
// complex_lit or rune_lit
p.next()
if p.tok == scanner.Char {
p.next()
p.expect('+')
p.parseNumber()
p.expect(')')
// TODO: x = ...
break
}
re := p.parseNumber()
p.expect('+')
im := p.parseNumber()
p.expect(')')
x = Const{cmplx{re.val.(*big.Rat), im.val.(*big.Rat)}}
typ = Complex128.Underlying
case scanner.Char:
// TODO: x = ...
p.next()
case scanner.String:
// string_lit
x = MakeConst(token.STRING, p.lit)
p.next()
typ = String.Underlying
default:
println(p.tok)
p.errorf("expected literal got %s", scanner.TokenString(p.tok))
}
if obj.Type == nil {
obj.Type = typ
}
obj.Data = x
}
// TypeDecl = "type" ExportedName Type .
//
func (p *gcParser) parseTypeDecl() {
p.expectKeyword("type")
pkg, name := p.parseExportedName()
obj := p.declare(pkg.Data.(*ast.Scope), ast.Typ, name)
// The type object may have been imported before and thus already
// have a type associated with it. We still need to parse the type
// structure, but throw it away if the object already has a type.
// This ensures that all imports refer to the same type object for
// a given type declaration.
typ := p.parseType()
if name := obj.Type.(*Name); name.Underlying == nil {
assert(Underlying(typ) == typ)
name.Underlying = typ
}
}
// VarDecl = "var" ExportedName Type .
//
func (p *gcParser) parseVarDecl() {
p.expectKeyword("var")
pkg, name := p.parseExportedName()
obj := p.declare(pkg.Data.(*ast.Scope), ast.Var, name)
obj.Type = p.parseType()
}
// FuncBody = "{" ... "}" .
//
func (p *gcParser) parseFuncBody() {
p.expect('{')
for i := 1; i > 0; p.next() {
switch p.tok {
case '{':
i++
case '}':
i--
}
}
}
// FuncDecl = "func" ExportedName Signature [ FuncBody ] .
//
func (p *gcParser) parseFuncDecl() {
// "func" already consumed
pkg, name := p.parseExportedName()
obj := p.declare(pkg.Data.(*ast.Scope), ast.Fun, name)
obj.Type = p.parseSignature()
if p.tok == '{' {
p.parseFuncBody()
}
}
// MethodDecl = "func" Receiver Name Signature .
// Receiver = "(" ( identifier | "?" ) [ "*" ] ExportedName ")" [ FuncBody ].
//
func (p *gcParser) parseMethodDecl() {
// "func" already consumed
p.expect('(')
p.parseParameter() // receiver
p.expect(')')
p.parseName() // unexported method names in imports are qualified with their package.
p.parseSignature()
if p.tok == '{' {
p.parseFuncBody()
}
}
// Decl = [ ImportDecl | ConstDecl | TypeDecl | VarDecl | FuncDecl | MethodDecl ] "\n" .
//
func (p *gcParser) parseDecl() {
switch p.lit {
case "import":
p.parseImportDecl()
case "const":
p.parseConstDecl()
case "type":
p.parseTypeDecl()
case "var":
p.parseVarDecl()
case "func":
p.next() // look ahead
if p.tok == '(' {
p.parseMethodDecl()
} else {
p.parseFuncDecl()
}
}
p.expect('\n')
}
// ----------------------------------------------------------------------------
// Export
// Export = "PackageClause { Decl } "$$" .
// PackageClause = "package" identifier [ "safe" ] "\n" .
//
func (p *gcParser) parseExport() *ast.Object {
p.expectKeyword("package")
name := p.expect(scanner.Ident)
if p.tok != '\n' {
// A package is safe if it was compiled with the -u flag,
// which disables the unsafe package.
// TODO(gri) remember "safe" package
p.expectKeyword("safe")
}
p.expect('\n')
assert(p.imports[p.id] == nil)
pkg := ast.NewObj(ast.Pkg, name)
pkg.Data = ast.NewScope(nil)
p.imports[p.id] = pkg
for p.tok != '$' && p.tok != scanner.EOF {
p.parseDecl()
}
if ch := p.scanner.Peek(); p.tok != '$' || ch != '$' {
// don't call next()/expect() since reading past the
// export data may cause scanner errors (e.g. NUL chars)
p.errorf("expected '$$', got %s %c", scanner.TokenString(p.tok), ch)
}
if n := p.scanner.ErrorCount; n != 0 {
p.errorf("expected no scanner errors, got %d", n)
}
return pkg
}
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